Just thought of another one: If the previously suggested name "Shiina" doesn't end up working for some reason (either because the name doesn't fit what your cat is like or whatever), then how about just plain old "Tama"?

It's a pretty generic name given to a lot of cats in Japan (sort of like how Fido is used for dogs here in the west). It even worked for Nagi's pet cat in "Hayate no Gotoku". And that cat is huge (a tiger actually)!

I had a cat many years ago that passed away, he had a rather unique name. I don't know how to spell it so I will spell it phonetically. Spah-goog-lee-us the wonder cat. When I took him to the vet they asked me how I spelled it, I said "B O B"